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2007-03-08 News Release

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Reinforced plastics blend for airflow sensor body

An injection moulded mass airflow sensor body for Audi engines is made up of a reinforced plastics blend that offers a wide temperature range and chemical resistance.

Hitachi Automotive Systems Europe, Ltd., has selected a reinforced Arnite* polybutylene terephthalate (PBT) blend from DSM Engineering Plastics for injection moulded mass airflow sensor body destined for Audi engines. Arnite TV4 261 30% glass reinforced grade PBT provides a combination of properties important to the application, including excellent flow, long term dimensional stability, stiffness and strength over a wide temperature range and chemical resistance. Production requires only moulding – no annealing is required to relieve internal stresses that could lead to warpage.

Find Information and Suppliers of glass fiber reinforced resins.

"Throughput is excellent with this design," said Andrew Bridge, Procurement & Design Manager for Hitachi. "The ability to mould the unit in one piece without annealing saves us two production steps compared to less sophisticated, two-piece approaches with alternate materials."

Hitachi Automotive Systems Europe benefits from flow, strength & dimensional accuracy of ARNITE* PBT. Click Go for High resolution image. photo: DSM

Intricate Audi engine mass airflow sensor body (shown right ->) for Hitachi Automotive Systems Ltd. is made from Arnite TV4 261. The 30% glass fiber reinforced injection moulding PBT resin provides a combination of properties important to the process application.

The Hitachi body serves both to mount the mass airflow sensor system precisely and to shape air flow using a moulded-in grid. To control the turbulent airflow, the grid induces a laminar flow that helps ensure accurate feedback about engine air intake temperature to the engine control unit. Mass airflow sensor data help engine control systems maintain an optimum air-fuel balance.

The grid's thin-wall elements and intricate geometry benefit from Arnite's flow properties, minimising moulded-in stresses and strains that later might contribute to warpage or unpredictable dimensional change, causing the sensor to misread airflow.

The design process for the component was a collaboration involving Hitachi, moulder and toolmaker W.H. Smith & Sons, Ltd., materials and processing expert DSM Engineering Plastics and design and mold flow specialist DSM/DADC (Design and Development Centre).

Hitachi Europe Ltd., is a wholly owned subsidiary of Hitachi, Ltd., Japan, headquartered in Maidenhead, UK. Hitachi Automotive Systems Europe Ltd. is headquartered in Horwich, Bolton U.K.

*Arnitel is a registered trademark of DSM Engineering Plastics, a business group forming part of DSM's Performance Materials cluster.

Find information about DSM Engineering Plastics.

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